Hybrid trading system for concurrently trading through both electronic and open-outcry trading mechanisms

ABSTRACT

A system and method of allocating orders in an exchange configured for trading by a combination of electronic and open-outcry trading mechanisms is provided. One method includes permitting multiple quotes to be disseminated to the market, and providing market making rights of varying degrees to entities having a physical presence on the floor of the exchange and entities remotely located away from the trading floor. The system includes a trade engine configured for receiving orders from market makers on and away from the trading floor. The system also includes executable instructions for allocating to designated primary market makers a portion of an incoming order remaining after first trading against public customer orders.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No. 60/632,726, filed Dec. 1, 2004, and is a continuation-in-part of U.S. application Ser. No. 10/423,201, filed Apr. 24, 2003, pending, and the entirety of each is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to the trading of securities or derivatives, such as options or futures.

BACKGROUND

The introduction of electronic trading mechanisms into exchanges for securities and derivatives has been steady and relentless. The desire for immediacy of order execution and dissemination of information is one reason for the steady switch to electronic mechanisms. The simple fact that trading volume is growing, with the accompanying need for an increasingly efficient trading environment, also favors the move toward electronic trading mechanisms.

Electronic exchanges, while efficient and immediate, do not necessarily supply the liquidity available in traditional, open outcry trading environments. One reason for this is the very efficiency that electronic mechanisms bring to an exchange. The speed with which trading takes place can adversely affect market makers by exposing them to unwanted risk. For example, if movement in the underlying security needs to be reflected in the options market, rapid response times are necessary. Communication delays can prevent market makers and others from changing their quotes or orders fast enough to reflect market conditions, thereby leading to smaller quote sizes to reduce the risk. Also, electronic exchanges generally cannot match the price improvement capabilities of an open outcry exchange where floor brokers and market makers can handle large and complex orders face-to-face.

BRIEF SUMMARY

In order to address the need for improvements on electronic trading mechanisms, a trading platform is disclosed herein that provides efficient and instantaneous electronic executions at the national best bid or offer (NBBO) along with the opportunity for price improvement.

According to a first aspect, a method of allocating orders for the purchase or sale of options contracts in an exchange configured for trading options contracts by a combination of electronic and open-outcry trading mechanisms is provided. The method includes receiving a quotation from a remotely located market maker, comparing an incoming order to orders maintained in an electronic database and matching and executing the incoming electronic order against an order resting on the electronic database if the order resting on the electronic database is from a public customer. The system then determines the allocation percentage of any remainder of the incoming electronic order among market participants having quotes or orders matching a price of the incoming electronic order by calculating a participation component and a pro rata component for each market participant. The remainder is then distributed for execution by multiplying the determined allocation percentage for each respective market participant by the amount of the remainder.

In another aspect, open outcry trading is merged with electronic trading in a method of trading derivatives in an exchange having both real-time screen-based trading and open-outcry trading capabilities. The method includes receiving electronic orders at a trade engine and matching and executing the incoming electronic order against an order resting on an electronic book if the resting order is from a public customer. A remote electronic quote may be received at the trade engine from at least one designated primary market maker positioned at a location remote from a floor of the exchange and at least one quote may be received from a designated primary market maker positioned on the floor of the exchange. The exchange determines an allocation percentage of any remainder of the incoming electronic order left after execution against resting public customer orders for allocation among designated primary market makers. The allocation percentage may be based on a total number of market makers at a matching price of the incoming electronic order, where the total number of market makers at the matching price corresponds to a predetermined collective allocation percentage for the designated primary market makers. The remainder of the electronic order is then allocated among the designated primary market makers by multiplying the predetermined collective allocation percentage by the remainder and dividing a result by the total number of designated primary market makers.

According to yet another aspect, an automated exchange system is provided for the purchase or sale of securities or derivatives. The system includes an electronic trade engine configured for receiving incoming orders generated by a market maker physically present at a floor of an exchange or a market maker at a location remote to the floor of the exchange. An electronic book is configured for storing the incoming orders. A database in communication with the trade engine comprises an allocation algorithm. A trade processor in communication with the database is configured to analyze and execute orders in accordance with an allocation algorithm selected from the database. The trade processor includes a first set of instructions for determining a total number of market makers at a matching price of the incoming electronic order, a second set of instructions for determining a collective allocation percentage for the designated primary market makers based on the total number of market makers at the matching price, and a third set of instructions for causing, based on the collective allocation percentage, the allocation among the designated primary market makers of a portion of the incoming electronic order remaining after execution against any public customer orders.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of a hybrid exchange system merging screen-based electronic orders with traditional open-outcry floor trading.

FIG. 2 is a block diagram of the electronic trading engine of FIG. 1.

FIG. 3 illustrates a method of allocating orders in the hybrid exchange system of FIGS. 1 and 2.

FIG. 4 illustrates a method of handling locked quotes in the hybrid exchange system of FIGS. 1 and 2.

FIG. 5 illustrates a method of handling crossed quotes in the hybrid exchange system of FIGS. 1 and 2.

FIG. 6 illustrates a method of enhancing market participation in the hybrid exchange system of FIGS. 1 and 2.

DETAILED DESCRIPTION

A system and method for trading securities, such as securities options is described herein. The trading mechanisms and rules described are based on providing incentives or limitations to particular classes of individuals or entities who are involved in trading at an exchange. For purposes of this specification, the following definitions will be used:

Broker/dealer=person or entity registered to trade for itself and/or on behalf of others at the exchange.

Public customer=person or entity, who is not a broker/dealer, trading on their own behalf through a broker/dealer or firm registered to trade at the exchange.

Firm=entity employing persons who represent the firm, or the firm's customers, on the exchange, such as market makers, floor brokers, broker/dealers, or other industry professionals.

Market maker=professional trader registered to trade at the exchange who is required to provide liquidity to a market, for example through streaming quotes for both a bid and an offer at a particular price.

Remote market maker (RMM)=market maker approved by the exchange to make transactions as a dealer-specialist from a location other than the physical trading station for the subject class of option (i.e., from off the floor of the exchange).

Designated primary market maker (DPM)=market maker designated by the exchange to be responsible for a fair and orderly market, and to provide continuous quotes, for a particular class of options.

Electronic DPM (eDPM)=is a member organization that is approved by the exchange to, remotely from off the floor of the exchange, function in allocated option classes as a DPM and to fulfill certain obligations required of DPMs except for floor broker and order book official obligations.

Floor broker=individual who represents orders from others in a trading crowd on the floor of an exchange.

Market participant=any person or entity that can submit orders or quotes to an exchange.

In-crowd market participant (ICM)=floor broker, market maker or designated primary market maker physically present on the floor of the exchange.

Non-in-crowd market participant (non-ICM)=market participants who are not physically present on the floor of the exchange.

Class of options=all series of options related to a given underlying security, where the underlying security may be, for example, publicly traded stock of a company.

FIG. 1 illustrates one embodiment of a system suitable for implementing the hybrid exchange system combining aspects of electronic, screen-based trading with traditional, open-outcry trading and implement various securities and derivatives trading methods described herein. The system 10 receives orders for the purchase or sale of securities, for example derivatives such as stock options, from numerous sources at a central order routing system (ORS) 12. ORS 12 may be any of a number of data processing systems or platforms capable of managing multiple transactions. In one embodiment, the order routing system can be implemented on a transaction processing facility (TPF) platform manufactured by IBM Corporation. For purposes of clarity, the examples herein will refer specifically to options. It should be understood that the system and methods disclosed herein may be applied to the trading of other types of securities and derivatives. An exchange utilizing the system and methods described herein may manage a number of classes of derivatives, where each of the plurality of classes of derivatives are associated with an underlying asset such as a stock, a bond, a note, a future, an exchange traded fund, an index, a commodity or other known asset types.

Orders may be entered into the ORS 12 from remote member firm systems 14, from member firm's booths 16 physically located at the exchange system 10, from market makers 18 present on the trading floor of the exchange and from RMMs or eDPMs 19 located off of the floor of the exchange. The member firm systems 14 may be located remotely from the geographical location of the exchange and use any of a number of standard land-line or wireless communication networks to direct orders electronically to the ORS 12. The member firm systems 14 communicate with one of several interfaces or protocols for transmitting their orders to the ORS 12. Examples of suitable interfaces are those using a distributed object interface based on the CORBA standard and available from the Object Management Group. Interfaces such as financial information exchange (FIX), which is a message-based protocol implemented over TCP/IP available from FIX Protocol, Ltd., or other known securities transaction communication protocols are also suitable protocols. In some instances, orders may even be made by telephone calls or facsimile transmissions directly to the booths 16 of member firms at the exchange. Orders submitted from a booth 16 at the exchange may come from a booth entry and routing system (BERS) 20 or a booth automated routing terminal (BART) 22.

The BERS 20 is a computer workstation that provides firm staff members at the booth with an entry template and a graphic user interface with a number of function buttons arranged on the display. Orders entered at the booth through BERS 20 typically consist of orders that were telephoned to the booth and orders that were wired to member firm-owned house printers in the booth. The orders entered through BERS are entered manually by booth staff using an order template and graphic user interface on the workstation. Generally, an order entered at BERS 20 will be routed to the ORS 12. Member firms, however, may specify that a particular order entered through BERS be routed to the BART 22 device. The BART 22 device, sometimes referred to as the “electronic runner,”allows member firms to maintain more control over their order flow. BART 22 allows each firm to customize certain ORS 12 parameters to route a certain portion of their order flow to the firm booth. For example, firms may instruct ORS 12 to send certain orders directly to their booths 16 based on the size of the order.

As with the BERS 20, BART 22 may be implemented on a touch-screen workstation located in the member firm booth. The BART 22 operator at the booth may electronically forward orders to desired destinations. Potential destinations for these booth-routed orders are the ORS 12, the electronic trade engine 24 in communication with the ORS 12, or the public automated routing (PAR) system 26 used by the floor brokers at the exchange. The PAR system 26 may be implemented as a PC-based, touch-screen order routing and execution system accessible by floor brokers on the floor of the exchange. The PAR system 26 terminals allow a floor broker to select an order from the workstation and receive an electronic trading card on which the floor broker may enter trade information such as its volume, price, opposing market makers, etc. When a floor broker completes a card, the floor broker can then execute a trade electronically with the touch of a finger on the touch screen interface. The PAR system 26 then transmits the completed order, also referred to as a “fill,” back to the ORS 12. The PAR 26 may be a fixed workstation or a mobile workstation in the form of a hand-held unit.

Market makers 18 on the floor of the exchange may enter quotes and orders via electronic devices, such as hand-held market maker terminals (MMT) 28. The MMT may be any of a number of electronic hand-held devices capable of communicating with the electronic trade engine 24 and ORS 12 through an application programming interface (API) such as FIX version 4.2 or CMi, an API available from Chicago Board Options Exchange, Incorporated of Chicago, Ill.

An example of a suitable handheld device is the Fujitsu Stylistic 3500 available from Fujitsu Ltd. of Tokyo, Japan. Market makers located away from the floor of the exchange, such as eDPMs and RMMs, the eDPMs and RMMs may communicate with the electronic trade engine 24 and ORS 12 through remote terminals utilizing these same types of APIs.

As illustrated in FIG. 2, the electronic trade engine 24 contains a trade processor 30 that analyzes and manipulates orders according to matching rules 32 stored in the database in communication with the trade processor. Also included in the electronic trade engine is the electronic book (EBOOK) 34 of orders and quotes with which incoming orders to buy or sell are matched with quotes and orders resting on the EBOOK 34 according to the matching rules 32. The electronic trade engine 24 may be a stand-alone or distributed computer system. Any of a number of hardware and software combinations configured to execute the trading methods described below may be used for the electronic trade engine 24. In one embodiment, the electronic trade engine 24 may be a server cluster consisting of servers available from Sun Microsystems, Inc., Fujitsu Ltd. or other known computer equipment manufacturers. The EBOOK 34 portion of the electronic trade engine 24 may be implemented with Oracle database software and may reside on one or more of the servers comprising the electronic trade engine 24. The rules database 32 may be C++ or java-based programming accessible by, or executable by, the trade processor 30.

When a trade is completed, whether on the floor in open outcry and entered into PAR 26 or automatically executed through the electronic trade engine 24, the fill information is sent through the electronic trade engine 24 and ORS 12. ORS 12 passes the fill information to the member firm systems and to a continuous trade match (CTM) system 38 which matches the buy side and sell side of a trade which, in turn, forwards the matched trades to the Options Clearing Corporation (OCC) 40, a third party organization that will verify that all trades properly clear. The electronic trade engine 24 also sends quote and sale update information through an internal distribution system 42 that will refresh display screens within the exchange 10 and format the information for submission to a quote dissemination service such as the Options Price Reporting Authority (OPRA) 44.

Utilizing the system described above, a hybrid trading system retaining the benefits of traditional floor-based open-outcry exchanges and incorporating the efficiency of traditional electronic trading systems may be implemented. One way of maintaining the availability, and associated liquidity, of open-outcry floor trading is to provide incentives to certain market makers who have a physical presence on the trading floor of the exchange, or entities that have a representative physically present on the trading floor of the exchange. Market makers are specific exchange members making bids and offers for their own account in absence of public buy or sell orders in order to spur the market and provide liquidity. In one embodiment, the electronic trade engine 24 receives all quotes and identifies the source of the quote before allowing the quote to trade with, or be placed on, the EBOOK 34. This filtering is preferably accomplished by verifying specific market maker identification information embedded with quote information, for example through appending a unique acronym associated with the market maker to an order, or by only accepting quotes from market maker terminals identifiable as on the premises of the exchange. In one implementation, each market maker is logged into the exchange such that every communication from the market maker to the exchange will be identified based on the login information associated with that market maker.

Remotely located market makers such as RMMs and eDPMs may be permitted to stream quotes into the exchange. The eDPMs may operate on the exchange as competing DPMs in a broad number of option classes. The eDPMs may act as specialists on the exchange by entering bids and offers electronically from locations other than the trading crowds where the applicable option classes are traded, and may not be required to have traders physically present in the trading crowd. As specialists, eDPMs may share in the DPM participation right in their allocated classes, with certain advantages provided to DPM on the floor of the exchange to maintain an incentive for DPM status. eDPMs may only participate in electronically traded orders.

The eDPMs may attract order flow to the exchange in allocated securities and to quote competitively. They may have special eligibility requirements and may be required to meet market performance standards and certain obligations including quoting requirements. eDPMs may be evaluated on how well they fulfill their market-making obligations as specialists, as well as on how successful they are at attracting order flow to the Exchange in allocated securities. eDPMs may apply for and be granted an appointment in any option classes on the Hybrid Trading System other than those in which they are already operating as the DPM on the floor of the Exchange.

An example of requirements for participation as an eDPM on the exchange may include that each eDPM fulfill all of the obligations of a market maker and of a DPM under the rules of the exchange. Additional differentiating characteristics of eDPMs may include requirements such as (i) providing continuous two-sided quotations in a percentage of the series of each allocated class, for example at least 90% of the series of each allocated class, or alternatively, responding to a certain percentage, such as 98%, of requests for quotes (RFQs) if RFQ functionality is enabled as determined by the exchange; (ii) assuring that its market quotations are accurate; (iii) complying with the bid/ask differential requirements of the exchange; (iv) assuring that its market quotations comply with the minimum size requirements prescribed by the exchange; and so on.

Other requirements for eDPMs may include an exchange membership requirement where each eDPM organization is required to own or lease a specified number of exchange memberships for the right to trade a particular number of classes of options. For example, although the specific numbers may be varied in different embodiments, each owned membership may permit trading in 30 classes of options and each leased membership may permit trading in 20 classes of options.

Other criteria by which an exchange may be configured to include eDPM participation is to allow more than one eDPM to be allocated to the same option class, to permit concurrent allocation to eDPMs option classes that have been allocated to a DPM. Other exchange governed limitations on eDPMs may be imposition of a minimum number of option classes for which an eDPM may be allocated and not allowing allocation to an eDPM of an option class for which the eDPM organization serves as DPM on the trading floor.

Similar to eDPMs, RMMs may only trade electronically and operate from remote locations away from the exchange floor. RMMs may enter quotes and orders remotely, from outside the physical trading station for the subject class of options, through any electronic interface approved by the exchange. RMMs, in one embodiment, are not permitted to quote in open outcry. RMMs may be obligated to provide continuous two-sided, legal-width quotations in predetermined percentage, for example 60%, of the series of their appointed classes.

The initial size of an RMM's quote may be subject to a minimum quantity. As one example, RMMs may be required to quote in sizes of at least ten contracts (undecremented size). Exceptions to the minimum quantity may be applied specifically to RMMs in a variety of ways. In one embodiment, if the underlying primary market disseminates a 100-share quote, an RMM's undecremented quote may be for as low as 1-contract (1-up), however, this ability may be conditioned on the process being automated (i.e., an RMM may not manually adjust its quotes to reflect 1-up sizes). RMM quotes may then be required to automatically return to at least 10-up when the underlying primary market no longer disseminates a 100-share quote. An example of another type of obligation that may apply to RMM status is the obligation to submit a single quote or maintain continuous quotes in one or more series of a class to which the RMM is appointed in response to a request from the exchange.

Referring again to FIGS. 1 and 2, when a market maker 18 enters a quote at a handheld terminal 28 or an eDPM enters a quote from a remotely located terminal, the quote is relayed to the electronic trade engine 24. The electronic trade engine 24 calculates the best bid or offer (BBO) from among all the quotes and orders entered and, if the quote is at the current BBO, the quote may be immediately matched against incoming orders subject to the various trade mechanisms described herein. If the new quote improves on the BBO, the new BBO is sent to the ORS 12 and is displayed on displays throughout the exchange. Alternatively, if the new quote matches the BBO, the new quote volume is added to the volume of the existing disseminated BBO. The ORS 12 also forwards the new BBO to the national quoting service known as OPRA, which then forwards this information to various quote vendors who subscribe to the OPRA service. If the new quote is not at, or better than, the current BBO, the quote is placed in the EBOOK 34.

When an order is received at the ORS 12, ORS 12 determines whether it qualifies for routing to the electronic trade engine 24. The ORS 12 examines both the order size and price. If the order price is at the market, it may be sent directly to the electronic trade engine for immediate execution. However, each order is also screened based on a two-tier order size analysis. First, the exchange may set a default auto-execution limit such that any amount of the order exceeding that size limit will be routed to the PAR system 26 for open-outcry trading on the floor of the exchange. Second, even if some or all of the order is within the exchange default size limit, each firm or broker may have a separate customized routing instruction that takes precedence over the exchange limit so that some or all of the order that would qualify for auto execution will be routed else where. For example, the firm or broker from whom the order originated may have previously instructed ORS 12 to have their orders routed first to their booth 16 for more detailed handling.

After passing through ORS 12, the trade processor 30 checks to see if the incoming order is immediately marketable against orders and quotes resting in the EBOOK 34. If the order price on the incoming order to buy or sell matches a counterpart offer to sell or buy on the EBOOK 34, then the order is considered marketable and the trade processor 30 looks at the matching rules database 32 to determine allocation of the incoming electronic order among the various counterpart quotes and orders on the EBOOK 34. According to a first method, as illustrated in FIG. 3, public customer orders resting in the electronic book have priority. If a new order, for example a buy order, arrives at the electronic trade engine that is away from the market price, it is placed on the EBOOK 34 (at steps 46, 48). If the new order is at the current market price, any public customer orders maintained in the EBOOK 34 which are at the same price will execute against the incoming order first and be executed in the order that the booked orders arrived at the EBOOK 34 (at steps 50, 52). Thus, if both the public customer order to sell on the book and an in-crowd market participant quote or order to sell on the book are at the same price, the incoming order to buy is first matched against the public customer order and any unfilled portion of the incoming order may then be executed against the quotes or orders of the in-crowd market participants. In other embodiments, public customer priority may be omitted, or a specific percentage of the incoming order may be allocated to public customers first.

If the incoming order does not match a price of a public customer order in the electronic book 34 and a single market participant is at the disseminated BBO, that market participant's quote is entitled to receive the incoming order up to the size of the market participant's quote (at 54, 56). If the size of the incoming order was such that a portion remains after execution against the market participant's quote, that remainder may be routed to the EBOOK 34 (at 57). In other embodiments, as discussed in greater detail below, the act of a new ICM, RMM or eDPM quote or order at the electronic trade engine 24 hitting an order from other than an ICM, RMM or eDPM will first trigger a temporary trading freeze to allow other ICMs, RMMs or eDPMs to submit orders or quotes within a predetermined time period at the same price of the original in-crowd market participant at the BBO and, if in that time period quotes and orders come in having some volume greater than the volume of the incoming electronic order, then that electronic order is allocated among the in-crowd market participants, RMMs and eDPMs according to a matching algorithm.

In yet other alternative embodiments, automatic trading of new public customer orders that are only matched in price by one resting in-crowd market participant, RMM or eDPM order or quote may be delayed a short period to allow other in-crowd market participants and eDPMs to bid or offer. If no additional quotes or orders are submitted at the BBO within the limited time frame of the quote trigger, then the lone market participant quoting at the BBO is entitled to the entire order. In other embodiments, the method of freezing a trade and permitting other market participants to obtain a portion of a trade may also be utilized in exchanges operating with screen-based, electronic trading only, without an open-outcry trading floor. In these other embodiments, any market participant quote or order may invoke the quote trigger procedure outlined above and then any subsequent market maker quote or order arriving within a preset time period may take part in the execution against the order.

Referring again to FIG. 3, when more than one market participant is quoting at the BBO, an allocation overlay may be applied to reserve a percentage of the order, or percentage remainder of the order if a public customer order had priority and executed against some of the order, as an incentive to one or more market participants (at step 58). For example, a percentage of the order may be set aside for the in-crowd market participant who first submitted an order (the “market turner”) that is now able to execute against the incoming order and the remainder would be sent on to be allocated by the trade processor according to a matching algorithm.

Another example of a priority overlay that may be implemented alone or in combination with the other priority overlays and procedures described herein is a priority for a designated primary market maker (DPM). The DPM overlay, also referred to as a participation right, may be implemented as a specific percentage of an order being reserved for the DPM, and any eDPMs, prior to allocation among the remaining in-crowd market participants. When used in combination with overlays for public customer priority and market turner priority, the DPM priority may be taken after the execution of any booked public customer orders that can trade with the new order but before the market turner priority. In other embodiments, the DPM may be allowed the greater of the fixed percentage they would receive from the order under the DPM priority or the percentage of the order they would get under a matching algorithm, described below, if the DPM quote was pooled with the remaining in-crowd market participants competing for a portion of the order. Any of the priority overlays described above may be used individually, in any combination, or turned off altogether.

The matching algorithm may include any of a number of criteria. In one embodiment of the matching algorithm, the electronic trade engine 24 allocates incoming orders to the multiple market participants quoting at the same price based on a parity factor and a pro rata, or depth of liquidity, factor calculated for each market participant. The parity factor of the matching algorithm treats as equal all market participants quoting at the relevant BBO (at step 60). Thus, if there were four market participants quoting or bidding at the best price, each would be assigned 25 percent for the parity component of the matching algorithm. Viewed in conjunction with the pro rata factor of the algorithm, the parity component of the algorithm provides incentive to market participants to quote at a better price than their competitors even though they may have a smaller quote size than other market participants quoting at the BBO.

The second component of the matching algorithm rewards those quoting larger sizes at the best price by providing the market participants a pro rata component based on the percentage of the volume of that market participant's quote size with reference to the sum of the total of all quote sizes at the best price (at step 62). For example, if the disseminated quote represents the quotes of market makers x, y, and z who quote for 20, 30, and 50 contracts respectively, then the percentages assigned under the pro rata component are 20% for x, 30% for y, and 50% for z. The parity and pro rata components are weighted, in one embodiment, by averaging the percentage that is derived for each of these components. The final allocation is then determined by multiplying that average by the size of the incoming order available. In one embodiment, the matching algorithm described above produces the following equation:

$\mspace{14mu}{{{{Participants}'}s\mspace{14mu}{allocation}\mspace{14mu}{of}\mspace{14mu}{incoming}\mspace{14mu}{order}} = {{incoming}\mspace{14mu}{order}\mspace{14mu}{size} \times \left\lbrack \frac{\frac{1}{{number}\mspace{14mu}{of}\mspace{14mu}{participants}} + \frac{{participant}\mspace{14mu}{quote}\mspace{14mu}{size}}{\sum{{participant}\mspace{14mu}{quote}\mspace{14mu}{sizes}}}}{2} \right\rbrack}}$ The final weighting of the parity and pro rata components set forth above is a straightforward mathematical average of the two components. The allocation based on the matching algorithm and the overlay preference, if any, is then executed among the qualified market participants (at step 64).

Other weightings of the components may be used in other embodiments to change the balance of the parity and pro rata components. Additionally, the matching algorithm described above may be tailored to provide additional weight to certain classes of market participants by reducing the parity weight allocated to a particular type of market participant. For example, in one embodiment, market makers may be given preferential treatment by allowing each market maker to receive a full participant share when adding up a number of participants quoting or bidding at the best price, while diminishing the parity share for broker/dealer market participants through lumping all broker/dealer market participants together as a single participant for purposes of the matching algorithm. In one embodiment, all non-market maker market participants are collectively considered one participant for purposes of the matching algorithm. In alternative embodiments, each of a plurality of separately recognized market participant relationships, other than market makers, may each be considered as a separate market participant for purposes of the matching algorithm. In one embodiment, only in-crowd market participants are eligible for allocations. In yet further embodiments, only in-crowd market makers will receive a full participant share when calculating allocation of the order through the matching algorithm.

In embodiments where both DPMs and eDPMs are competing, they may be required to meet certain criteria before they may partake in any participation entitlement for DPMs and eDPMs. In one embodiment, in order to be entitled to the participation entitlement, the DPM/eDPM must be quoting at the best bid/offer on the exchange; the DPM/eDPM may not be allocated a total quantity greater than the quantity that the DPM/eDPM is quoting at the best bid/offer on the exchange; and the participation entitlement is based on the number of contracts remaining after all public customer orders in the book at the best bid/offer on the Exchange have been satisfied.

A variety of percentage participation right thresholds may be set for the DPMs and eDPMs. In one embodiment, a participation right allocation among competing DPMs and eDPMs may include a collective DPM/eDPM participation entitlement that varies based on the number of market makers For example the collective participation right for DPMs/eDPMs may be 50% when there is one market maker also quoting at the best bid/offer on the exchange; 40% when there are two market makers also quoting at the best bid/offer on the exchange; and 30% when there are three or more market makers also quoting at the best bid/offer on the Exchange.

As among competing DPMs and one or more eDPMs, the allocation of participation entitlement may also be varied. The participation entitlement may be set such that, when the DPM and one or more eDPMs are quoting at the best bid/offer on the exchange, the eDPM participation entitlement may be one-half (50%) of the total DPM/eDPM entitlement and may be divided equally by the number of eDPMs quoting at the best bid/offer on the Exchange. The remaining half may be allocated to the DPM. If the DPM is not quoting at the best bid/offer on the exchange and one or more eDPMs are quoting at the best bid/offer on the exchange, then the eDPMs may be allocated the entire participation entitlement (divided equally between them). If no eDPMs are quoting at the best bid/offer on the exchange and the DPM is quoting at the best bid/offer on the exchange, then the DPM shall be allocated the entire participation entitlement. If only the DPM and/or eDPMs are quoting at the best bid/offer on the exchange, with no market makers at that price, the participation entitlement shall not be applicable and the allocation procedures of the matching algorithm discussed above may be applied.

With the introduction of eDPMs, DPMs will receive a smaller participation entitlement but will continue to need multiple memberships to effectively operate a DPM trading crowd and will continue to fulfill agency and other obligations. In one embodiment, as way of increasing incentives to function as the DPM on the floor of the exchange, DPMs that use more than one membership in any given trading crowd on the floor of the exchange to increase their ability to participate via UMA may have their parity component in the matching algorithm described above calculation increased by one. Thus, in a 4 market participant calculation, where the DPM would normally be a ¼portion of the parity component, the DPM would be given credit for an additional participant so that the parity component for the DPM increases to ⅖.

An example of a trade executed using the public customer priority and matching algorithm with parity and pro rata components is provided below. If an incoming order from a public customer to buy 200 option contracts at $2.00 each arrives at the electronic trade engine 24, the trade engine checks to see what orders and quotes are available to execute against this incoming order. In this example, orders resting on the electronic book 34 to sell include: two public customer orders to sell 50 contracts each at $2.00, three market maker quotes each with offer to sell at $2.00 in volumes of 10, 40, and 50, respectively; and five broker/dealer orders for 20 contracts each at $2.00. The public customer orders resting on the electronic book, a total of 100 contracts, are immediately executed against the incoming order which reduces the remaining incoming order volume to 100 contracts.

Assuming no other overlay preferences are being used, these remaining 100 contracts are allocated according to the matching algorithm. First, the electronic trade engine calculates a parity component. Assuming that broker/dealer participants are reduced in weight by considering all of them together as a single participant for purposes of the matching algorithm, their are four participants, where the three market makers each are a full participant and the five broker/dealers are lumped together as a single market participant. This results in the parity component of 25 percent for each full market participant and 5 percent for each of the broker/dealers who qualify as a partial market participant in the matching algorithm. Accordingly, each of the broker/dealers would have a 5 percent parity component and a 10 percent pro rata component (each of the broker/dealers having the same volume in this example) resulting in an overall allocation of 7.5 percent of the remaining 100 contracts or 7.5 contracts. In the case of fractional contracts resulting from an allocation calculation, a time priority may be implemented to round up the allocation of contracts to broker/dealers who bid or offer at the best price first and to round down number of contracts allocated to those who bid or offer later so that integer number of contracts are exchanged. With respect to the three market makers in this scenario, each receives a 25 percent participation component and a 5, 20, and 25 percent, respectively pro rata share components which, when weighted in a straight average results in an allocation to the market makers of 15, 22.50 and 25 shares allocated, respectively, to these three market makers. In instances such as this, where there are fractional allocations between classes of market participants, a rounding up or down may be randomly allocated to achieve a whole number distribution of contracts consistent with the order size. Alternatively, the inter-class fractional allocation may be corrected based on first to order or quote.

In another embodiment, additional incentive to participate as an eDPM or DPM may be achieved on the exchange through the ability of an order provider (i.e., any firm who sends agency orders to the exchange to select a preferred DPM and to give that DPM a larger portion of the DPM participation right. This added functionality may be programmed into the electronic trade engine 24, for example as part of the matching rules 32. In one implementation, a firm trading at the exchange may mark an order with a preferred DPM. Only DPMs and eDPMs can be the preferred DPM. The firm may use a standard acronym for each preferred DPM firm, using the order entry software available at the exchange.

The trigger for selection of a preferred DPM may be entry of a symbol, text or number in an available tag or data location on the order entry screen. For example, a “P:” in optional data for orders coming through COMPASS and tag 9324 for orders through FIX for the preferred DPM firm. The trade engine 24 may then create a table that contains all of the DPM and eDPM acronyms as well as the link to the standard acronym. The table may be updateable intra-day by a help desk at the exchange that maintains the table through a graphic user interface The trade engine will use the table and the existing table including eDPM and DPM acronyms assigned to the particular class to determine whether the preferred DPM allocation can be used. If the preferred DPM is at the best price when the trade engine receives the order, the preferred DPM will receive N% of the total participation right. If the preferred DPM is not at the best price, the order will trade as any other order. If the preferred DPM is an eDPM, the DPM will get the remainder of the participation right. If the preferred DPM is the floor DPM, the eDPMs will share the remainder of the participation right. The DPM complex (i.e. the entirety of the DPM and eDPMs) may receive the greater of the allocation calculated by the matching algorithm and the DPM participation right or simply the DPM participation right.

In the hybrid exchange environment described, where electronic, screen-based trading and manual, open-outcry pit trading are interconnected, the ability of multiple market makers on the floor to stream quotes for dissemination to the market on the same particular product may lead to quote interaction such as quote locking or crossing. A quote “locks” another quote when the bid price of an in-crowd market maker's quote matches the offer price of another in-crowd market maker's quote. As shown in FIG. 4, the locking of market maker quotes is detected by the electronic trade engine, which automatically invokes a quote interaction mechanism (at step 66). A delay timer is started and the electronic trade engine prevents the market makers with the locked quotes from trading with each other for a predetermined period set by the delay timer (at steps 68, 70). Although the locked market maker quotes will not automatically trade during the delay period, the locked quote is disseminated to the market and made available for execution against orders from any market participant order that can be routed to the electronic book either directly or through the PAR system (at step 72). After a notification delay, which is a time less than the overall delay timer for preventing the automatic trade, the electronic trade engine will notify each of the locked in-crowd market makers over their respective market maker terminals with a message that includes the identification of the other in-crowd market participants on the other side of the lock (at step 74). At this point, the locked in-crowd market makers can move their quotes away from locking with other in-crowd market makers or they can choose to leave their quotes alone.

After expiration of a complete lock period, which includes the initial notification period, any quotes still locked will automatically trade against each other (at step 76). In one embodiment, if more than one incoming quote locks an existing quote, the time period will not be restarted for the original locked parties each time a new incoming quote is entered. In other embodiments, a new delay timer specific to each new quote that locks against already locked quotes may be implemented to allow each new market maker the same period of time in which to revise their own quote as the initial locked pair.

Incoming quotes will be executed against resting quotes according to the matching algorithm described above and, if an incoming quote locks against more than one resting quote, that incoming quote will also be allocated among the resting quotes using the matching algorithm allocation described above. In one embodiment, the notification period, which is the period after locking within which a notification is sent to each of the locked quoting parties, is one second. The lock period, which is the total period in which the market maker quotes are kept from trading against each other, may be ten seconds. In other embodiments, these preset time periods may be adjusted to suit the specific needs of the exchange. Preferably, the lock period and notification period are monitored and applied at the electronic trade engine 24 based on the matching rule instructions 32 maintained in the electronic trade engine 24.

An example of a locked market scenario handled according to the method described above is as follows (where MM1 and MM2 refer to first and second in-crowd market makers):

If MM1 sends a quote of 1.00-1.20 100×100 (bid-offer bid volume x offer volume) at 9:05:00 and MM2 simultaneously sends a quote of 0.95-1.20 200 ×200, the disseminated quote is at 1.00-1.20 100×300. If, ten seconds later at 9:05:10, MM3 (a third market maker) sends in a quote at 1.20-1.40 50×50 the quotes from MM1 and MM2 lock with the quote from MM3 so that a disseminated quote is published at 1.20-1.20 50×300. One second later, at 9:05:11, a locked market message is sent to each of MM1, MM2 and MM3. Assuming that none of the market makers decide to change their quotes, 50 contracts will be traded at 1.20 and allocated among MM1 and MM2 through the matching algorithm described above (assuming equal weighting of the parity component and pro rata components, of 21 contracts to MM1 and 29 contracts to MM2, at 9:05:20. Following execution of the 50 contract trade, the quote disseminated to the market would be at 1.00-1.20 100×250. In one embodiment, if the resting market marker quote is removed from the book prior to expiration of the lock period, the later, incoming quote will be restored to its original value. Similarly, if the resting quote and incoming quote lock, and a trade occurs between the two quotes leaving remaining volume to be traded in the incoming quote, the incoming quote will also be restored to its original value.

In some instances, market maker quotes may cross during trading. A crossed quote occurs when the bid of a one market maker's quote is higher than an offer of another market maker's quote. For example if MM1 has a quote resting on the EBOOK 34 of 1.20-1.30 and MM2 later comes in with a quote at either 1.05-1.15 or 1.35-1.45, then the quote are “crossed.” A crossed quote, if disseminated to the market, would show a bid price that is higher than an offer price, for example 1.35-1.15. This situation is generally considered unacceptable to an exchange because market makers trading with each other will remove liquidity from the market and because crossed quotes set up a perfect arbitrage. Because of these problems, crossed quotes are not disseminated. In one embodiment, referring to FIG. 5, the trade processor 30 will automatically identify and alter the later arriving quote that would cross with the quote already resting on the EBOOK 34 (at step 78). The trade processor 30 will widen the later quote to fully lock with the first market maker's quote and prevent dissemination of the crossed quote (at step 80). Thus, in the example of MM1 and MM2 above, the exchange will automatically move MM2's quote from 1.05-1.15 to 1.05-1.20 or from 1.35-1.45 to 1.30-1.45 so that the quotes are “locked.” The remaining steps for handling the now locked quotes will be the same as in FIG. 4 (at step 82). If the widened quote, or any portion, remains after expiration of the delay time and execution against the resting locked quote, the widened quote will be returned to its original width and disseminated accordingly (at step 84).

Numerous variations of market maker quotes locking or crossing, mixed with on-going receipt of orders from customers to execute against the bid or offer of the resulting locked quotes, may be handled according to the methods described above. In one embodiment, the notification and lock period used for locked quotes will be the same as those used for crossed quotes. The locked market notification message will be sent to in-crowd market participants in crossed quote situations and locked quote situations. In other embodiments, the quote locking and crossing procedures described above may be used in electronic-only exchanges where all other specific classes of market participants, such as all market makers, will invoke these procedures.

In another embodiment, an additional trading mechanism may be implemented to foster and encourage participation in trades by temporarily restraining execution of an in-crowd market participant or eDPM quote that arrives at the electronic trade engine 24 that is marketable against a resting order on the EBOOK 34 that is not from an in-crowd market participant. The purpose of the temporary restraint on execution is to allow a preset grace period within which other in-crowd market participant quotes or orders maybe submitted at the best price represented by the new in-crowd market participant or eDPM quote. Advantages of temporarily restraining this type of trade included encouraging more in-crowd market participants and eDPMs to quote at the best price and the removal of any communication or computer hardware advantage among the market participants. In one embodiment, delaying execution of the resting order consists of delaying allocation of the resting order.

One embodiment of an implementation of this quote trigger mechanism is illustrated in FIG. 6. Upon detecting a quote from an in-crowd market participant or an eDPM at a new best price which would match against an order on the electronic book from a non-ICM, the electronic trade engine 24 will remove the quantity of the resting order that would be tradeable against the incoming quote and hold it and the incoming quote for a predetermined period of time (at steps 86, 88). Any desired preset hold period may be used, however in one embodiment it is contemplated that a five second hold period is used. In other embodiments, the hold period may be fixed anywhere in the range of 0.5- 5.0 seconds. After removing the quantity of the resting order, the electronic trade engine 24 will treat the removed quantity of resting order as having been sold and disseminate a last sale market data message so that the OPRA system 44 will indicate the trade has taken place (at step 90). The electronic trade engine 24 will update the top-of-the-market (i.e. update the quote) as though the trade had immediately occurred (at step 92).

During the hold period, any other in-crowd market participant quotes orders that would also be marketable against the original resting order are gathered and the resting order volume at the current best price will be further reduced, if any still remains in the book (at step 94). At the expiration of the hold period, the accumulated in-crowd market participant and eDPM quotes and orders are traded against the resting orders (at step 96). If the size of the resting order was greater than the size of the sum of the in-crowd market participant and eDPM quotes and orders, each of the quotes and orders would execute fully against the resting order. If the size of the resting order is less than the sum of the in-crowd market participant and eDPM quotes and orders, the resting order is allocated among the quotes and orders according to the matching algorithms discussed above. The electronic trade engine will then send fill reports of the executed trades to the ORS 12 for distribution to the appropriate source of the quotes or orders involved.

In order to provide a market and control the opening trades in the hybrid exchange 10 described above, a market opening procedure may be implemented that varies from the steady-state trading mechanisms described above. In the context of a hybrid exchange for securities options, opening takes place after the market for the underlying security is underway. Opening, in the securities option exchange, is considered to last for the period of time it takes to calculate an opening price. The electronic trade engine 24, utilizing start-up rules stored in its matching rules 32 database, will publish an expected opening price (EOP) and an expected opening size (EOS) to the market through the various APIs supported by the exchange. The EOP is updated as pre-market conditions change.

In one embodiment, the opening procedure starts when the opening trade for the underlying security is received. The electronic trade engine 24 will then start a timer and move into an opening rotation state. In the opening rotation state, the EOP and EOS are calculated based on size and prices of orders and quotes received prior to opening of the market and disseminated to DPMs and market makers. After the timer expires, the electronic trade engine 24 will look to see if a valid quote has been submitted by the DPM for each series of options. If valid quotes exist, the market will proceed to open. If a DPM has not entered a valid quote, the electronic trade engine 24 will not proceed to opening, thereby allowing a DPM to delay the opening process if necessary. When there is an imbalance between buy and sell orders at opening, a matching algorithm is applied. The matching algorithm may be as described above or it may be some other algorithm, for example a first in first out (FIFO) algorithm. In one embodiment, as with any of the algorithms and procedures described above, the exchange may control opening procedure algorithm choice by class or series and by day so that a variety of combinations of procedures may be implemented for a particular class or series of securities options on any given day. In one version of an opening procedure, quotes will immediately trade against quotes and no quote locking delay will be implemented.

As has been described above, the hybrid exchange system merges electronic and open outcry trading models while at the same time offering certain market participants the ability to stream electronically their own quotes. Incoming electronic orders from public customers and certain types of broker/dealers that execute against market participants' quotes will be allocated to the best quoters pursuant to a trade matching algorithm. This trade matching algorithm retains public customer priority and rewards in-crowd market participants pursuant to a formula that balances the concepts of quoting at the best price with providing liquidity at the best price, while encouraging greater electronic order flow with eDPMs. The ability to stream electronic quotes combined with the ability to receive electronic and instantaneous allocations of incoming orders will reward in-crowd market participants and eDPMs that quote at the best price and may have the attendant benefit of tightening the exchange's best disseminated quote.

The disclosed hybrid exchange system and method also retains the benefits inherent in a floor-based, open outcry exchange. Order entry firms will continue to have the ability to have their floor brokers walk into a trading crowd and request markets on behalf of their customers. Trading crowds may continue to offer price discovery to orders of size, complex orders, and other orders that are exposed to the open outcry, auction market environment. Additionally, the hybrid exchange system and method enhance the automatic execution capabilities of broker/dealers. For example, non-market maker broker/dealers have the same access to the electronic execution features as public customers in designated classes. This allows eligible broker/dealers (e.g. non-ICM broker/dealers) to receive more automatic executions of the orders they route to the exchange.

Also, the disclosed hybrid exchange system and method “opens the book” to certain types of broker/dealer orders. In one implementation, broker/dealer orders are only permitted access to an autoexecution feature that allows for immediate electronic execution of orders routed to the exchange. For example, certain broker/dealer orders will be eligible for placement into the EBOOK 34 against which they may be executed electronically. Broker/dealers may also electronically access the EBOOK 34 (i.e., buy or sell the book) in eligible classes. This feature will allow for the automatic execution of broker/dealer orders against resting limit orders in the book, whether they are public customer or broker/dealer orders in the book.

Although the system and methods described herein preferably relate to a hybrid system incorporating and involving active participation from a trading floor and a screen-based electronic trading crowd, many of the procedures described may be applied to an exclusively electronic, screen-based exchange that does not include floor based, open-outcry trading. As will be appreciated by those of ordinary skill in the art, mechanisms for the priority overlays, quote crossing, quote locking, matching algorithm and other features described above may all be modified for application to electronic-only trading. For example, by altering several of the rules relating to which market participants may obtain the benefit of these procedures from in-crowd market participants to other combinations of market participants, such as eDPMs an improved electronic marketplace may also be achieved.

It is therefore intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the scope of this invention. 

1. A method of allocating orders for the purchase or sale of securities or derivatives in an exchange configured for trading securities or derivatives by a combination of electronic and open-outcry trading mechanisms, the method comprising: receiving an incoming electronic order at a trade engine of the exchange; matching and executing the incoming electronic order against an order resting on an electronic book if the order resting on the electronic book is from a public customer; receiving at least one remote electronic quote at the trade engine from at least one market participant positioned at a location remote from an open-outcry trading floor of the exchange; determining a first allocation percentage of a remainder of the incoming electronic order for each eligible market participant on the open-outcry trading floor of the exchange and at a location remote from the open-outcry trading floor, each eligible market participant having one of a quote or an order matching a price of the incoming electronic order, wherein the first allocation percentage comprises a participation component and a pro rata component and is calculated at the trade engine for all eligible market participants, wherein all eligible market participants comprises each eligible market participant on the open-outcry trading floor and each eligible market participant at a location remote from the floor of the exchange, according to the relation: ${{allocation}\mspace{14mu}{percentage}} = {\quad{\left\lbrack \frac{\frac{1}{{number}\mspace{14mu}{of}\mspace{14mu}{participants}} + \frac{{participant}\mspace{14mu}{quote}\mspace{14mu}{size}}{\sum{{participant}\mspace{14mu}{quote}\mspace{14mu}{sizes}}}}{2} \right\rbrack;}}$ and allocating to each eligible market participant on the open-outcry trading floor of the exchange and at a location remote from the open-outcry trading floor a greater of the first allocation percentage or a predetermined second allocation percentage of the remainder of the incoming electronic order.
 2. The method according to claim 1, wherein the at least one market participant positioned at a location remote from the open-outcry trading floor is a designated primary market maker.
 3. The method according to claim 1, wherein the participation component is the same for all eligible market participants.
 4. The method according to claim 1 wherein the market participants comprise in-crowd market participants and remotely located market participants.
 5. The method of claim 1, wherein all eligible market participants comprising a particular category of market participant comprise a single eligible market participant for purposes of determining the allocation.
 6. The method of claim 5, wherein the particular category of market participant comprises in-crowd non-market maker broker/dealers.
 7. A method of allocating orders for the purchase or sale of securities or derivatives in an exchange configured for trading securities or derivatives by a combination of electronic and open-outcry trading mechanisms, the method comprising: receiving an incoming electronic order at a trade engine; matching and executing the incoming electronic order against an order resting on an electronic book if the order resting on the electronic book is from a public customer; receiving at least one remote electronic quote at the trade engine from at least one market maker positioned at a location remote from an open-outcry trading floor of the exchange and at least one quote from a market maker positioned on the open-outcry trading floor of the exchange; determining an allocation percentage of a remainder of the incoming electronic order for allocation among market makers based on a total number of market makers at a matching price of the incoming electronic order, wherein the total number of market makers at the matching price corresponds to a predetermined collective allocation percentage for the market makers; and the trade engine allocating the remainder of the electronic order among the market makers by multiplying the predetermined collective allocation percentage by the remainder and dividing a result by the total number of market makers according to the relation: ${{{allocation}{\mspace{14mu}\;}{percentage}} = \left\lbrack \frac{\begin{matrix} {\frac{1}{{number}\mspace{14mu}{of}\mspace{14mu}{market}\mspace{14mu}{makers}} +} \\ \frac{{market}\mspace{14mu}{maker}\mspace{14mu}{quote}\mspace{14mu}{size}}{\Sigma\mspace{14mu}{market}\mspace{14mu}{maker}\mspace{14mu}{quote}\mspace{14mu}{sizes}} \end{matrix}}{2} \right\rbrack},$ wherein the total number of market makers receiving an allocation of the remainder comprises the at least one market maker at a location remote from an open-outcry trading floor of the exchange and the at least one market maker positioned on the open-outcry trading floor of the exchange.
 8. The method according to claim 7, wherein the total number of market makers at the matching price is one and the corresponding predetermined collective allocation percentage is 50 percent.
 9. The method according to claim 7, wherein the total number of market makers at the matching price is two and the corresponding predetermined collective allocation percentage is 40 percent.
 10. The method according to claim 7, wherein the total number of market makers at the matching price is three and the corresponding predetermined collective allocation percentage is 30 percent.
 11. The method according to claim 7, wherein the step of allocating the remainder of the incoming electronic order among the market makers further comprises multiplying the remainder allocated to a remote designated primary market maker by a fixed percentage.
 12. The method according to claim 11, wherein the remainder is further divided equally among remote market makers at the matching price.
 13. An automated exchange system for the purchase or sale of securities or derivatives in an exchange configured for trading securities or derivatives comprising: an electronic trade engine configured for receiving incoming orders generated by a market maker physically present at an open-outcry trading floor of an exchange or a market maker at a location remote to the open-outcry trading floor of the exchange; an electronic book configured for storing the incoming orders received by the electronic trade engine; a database comprising an allocation algorithm, the database in communication with the electronic trade engine; and a trade processor in communication with the database for analyzing and executing orders according to an allocation algorithm selected from the database, the trade processor comprising: a first set of instructions for determining a total number of market makers physically present at the open-outcry trading floor of an exchange and at a location remote to the open-outcry trading floor of the exchange at a matching price of the incoming electronic order; a second set of instructions for determining a collective allocation percentage for market makers based on the total number of market makers located at the open-outcry trading floor of the exchange, and at locations remote to the open-outcry trading floor, at the matching price according to the relation: ${{allocation}{\mspace{14mu}\;}{percentage}} = \left\lbrack \frac{\begin{matrix} {\frac{1}{{number}\mspace{14mu}{of}\mspace{14mu}{market}\mspace{14mu}{makers}} +} \\ \frac{{market}\mspace{14mu}{maker}\mspace{14mu}{quote}\mspace{14mu}{size}}{\Sigma\mspace{14mu}{market}\mspace{14mu}{maker}\mspace{14mu}{quote}\mspace{14mu}{sizes}} \end{matrix}}{2} \right\rbrack$ and a third set of instructions for allocating among the market makers a portion of the incoming electronic order remaining located at the open-outcry trading floor of the exchange, and at locations remote to the open-outcry trading floor, after execution against any public customer orders based on the collective allocation percentage.
 14. The automated exchange system of claim 13, wherein the third set of instructions further comprises instructions for multiplying the portion by the collective allocation percentage and then dividing a result by a total number of designated primary market makers.
 15. The method according to claim 14, wherein the remainder is further divided equally among remote market makers at the price matching the electronic order.
 16. The automated exchange system according to claim 13, wherein the third set of instructions further comprises multiplying the remainder allocated to a remote market maker by a fixed percentage. 